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Fig. 14

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Abundance ratios of OCS and H2S relative to SO2 for each source for the layers at Τ = 100 Κ for G328.2551-0.5321 and the sample from Herpin et al. (2009) ordered according to their assumed age sequence, G328.2551-0.5321 being the youngest and IRAS 18162-2048 the most evolved.

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